qemu

FORK: QEMU emulator
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boot.c (3385B)

      1 /*
      2  * SPDX-License-Identifier: GPL-2.0-or-later
      3  *
      4  * QEMU OpenRISC boot helpers.
      5  *
      6  * (c) 2022 Stafford Horne <shorne@gmail.com>
      7  */
      8 
      9 #include "qemu/osdep.h"
     10 #include "cpu.h"
     11 #include "exec/cpu-defs.h"
     12 #include "elf.h"
     13 #include "hw/loader.h"
     14 #include "hw/openrisc/boot.h"
     15 #include "sysemu/device_tree.h"
     16 #include "sysemu/qtest.h"
     17 #include "sysemu/reset.h"
     18 
     19 #include <libfdt.h>
     20 
     21 #define KERNEL_LOAD_ADDR 0x100
     22 
     23 hwaddr openrisc_load_kernel(ram_addr_t ram_size,
     24                             const char *kernel_filename,
     25                             uint32_t *bootstrap_pc)
     26 {
     27     long kernel_size;
     28     uint64_t elf_entry;
     29     uint64_t high_addr;
     30     hwaddr entry;
     31 
     32     if (kernel_filename && !qtest_enabled()) {
     33         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
     34                                &elf_entry, NULL, &high_addr, NULL, 1,
     35                                EM_OPENRISC, 1, 0);
     36         entry = elf_entry;
     37         if (kernel_size < 0) {
     38             kernel_size = load_uimage(kernel_filename,
     39                                       &entry, NULL, NULL, NULL, NULL);
     40             high_addr = entry + kernel_size;
     41         }
     42         if (kernel_size < 0) {
     43             kernel_size = load_image_targphys(kernel_filename,
     44                                               KERNEL_LOAD_ADDR,
     45                                               ram_size - KERNEL_LOAD_ADDR);
     46             high_addr = KERNEL_LOAD_ADDR + kernel_size;
     47         }
     48 
     49         if (entry <= 0) {
     50             entry = KERNEL_LOAD_ADDR;
     51         }
     52 
     53         if (kernel_size < 0) {
     54             error_report("couldn't load the kernel '%s'", kernel_filename);
     55             exit(1);
     56         }
     57         *bootstrap_pc = entry;
     58 
     59         return high_addr;
     60     }
     61     return 0;
     62 }
     63 
     64 hwaddr openrisc_load_initrd(void *fdt, const char *filename,
     65                             hwaddr load_start, uint64_t mem_size)
     66 {
     67     int size;
     68     hwaddr start;
     69 
     70     /* We put the initrd right after the kernel; page aligned. */
     71     start = TARGET_PAGE_ALIGN(load_start);
     72 
     73     size = load_ramdisk(filename, start, mem_size - start);
     74     if (size < 0) {
     75         size = load_image_targphys(filename, start, mem_size - start);
     76         if (size < 0) {
     77             error_report("could not load ramdisk '%s'", filename);
     78             exit(1);
     79         }
     80     }
     81 
     82     if (fdt) {
     83         qemu_fdt_setprop_cell(fdt, "/chosen",
     84                               "linux,initrd-start", start);
     85         qemu_fdt_setprop_cell(fdt, "/chosen",
     86                               "linux,initrd-end", start + size);
     87     }
     88 
     89     return start + size;
     90 }
     91 
     92 uint32_t openrisc_load_fdt(void *fdt, hwaddr load_start,
     93                            uint64_t mem_size)
     94 {
     95     uint32_t fdt_addr;
     96     int ret;
     97     int fdtsize = fdt_totalsize(fdt);
     98 
     99     if (fdtsize <= 0) {
    100         error_report("invalid device-tree");
    101         exit(1);
    102     }
    103 
    104     /* We put fdt right after the kernel and/or initrd. */
    105     fdt_addr = TARGET_PAGE_ALIGN(load_start);
    106 
    107     ret = fdt_pack(fdt);
    108     /* Should only fail if we've built a corrupted tree */
    109     g_assert(ret == 0);
    110     /* copy in the device tree */
    111     qemu_fdt_dumpdtb(fdt, fdtsize);
    112 
    113     rom_add_blob_fixed_as("fdt", fdt, fdtsize, fdt_addr,
    114                           &address_space_memory);
    115     qemu_register_reset_nosnapshotload(qemu_fdt_randomize_seeds,
    116                         rom_ptr_for_as(&address_space_memory, fdt_addr, fdtsize));
    117 
    118     return fdt_addr;
    119 }